Unique database entry validation - but in reverse!
Is it possible to only allow a user to register if their company name already exists in the database somewhere? I guess it's the Unique Database Entry form validation but in reverse! I basically need to ensure that all users from a company register using exactly the same company name, for example ABC Company Ltd and not ABC Company or just ABC - this is because I then need to link them together on that database field. So, when they fill in the registration form and maybe mistype or enter the company name wrongly, it would show an error message.
